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atas, kiri, kanan sisa = 3 cm
panjang karton / panjang foto = lebar karton / lebar foto
30 / (27 - x) = 20 / 14
3 / (27 - x) = 1 / 7
21 = 27 - x
x = 6 cm
lebar bawah karton adalah 6 cm